No, but seriously... There are so many things you can put on your site. Everyone is individual and unique. In all reality, it just depends on what information you deem to be the most important when you're starting out with a potential roleplay. Some people really do like to lay it all out on the table (like me), and others prefer to keep a shroud of mystery around themselves.
As far as the extra pages, I always suggest three things:
1. A plots page. If you've got a lot of plots that you're just dying to try out, so many so that it starts to look clunky on your genres page, then I would consider giving them their own page. Mark them clearly with their genre and what character you'd be interested in playing. Include perhaps how many characters you each need to play to make the plot work, or any lore you've thought up that's relevant. It'll help your potential partner get into your head and see your vision as well as you do.
2. A samples page. Some people request samples before writing with someone else because they want to see if their writing styles will match. This doubles as you things for you. A, potential partners can see what your writing looks like and will judge if you're someone they want to write with or someone that's similar in style to them. B, you have a selection to pull from in a handy-dandy location if someone else requests you present yourself with some samples ready to go.
3. A characters page. Some people make characters up for every story and some people reuse their favorite characters again and again. I'm in the second camp, so I love posting about my OCs on my site. If you want to give people a taste of the type of character you write and prefer writing, maybe give a little bit about them or list out some tropes. "When it comes to characters, I'm best with writing soft girls and bad boys. Here's some examples of characters I've written in the past..."